Good grief, but then I'm not a misanthrope.
Anecdotally, I've worked with a number of Americans and none of them struck me as "What's in it, for me?"-types. You can even see it in the posts from many AH members, conservative as well as liberal. There are some outliers, I'll give you that, and you can look them up on this forum.
You're perpetually misunderstood by a number of members here for some reason. Why do you think that is so?
The "White Man's Burden" burden argument.

Please look that up.
You think I'm completely ignorant about this? At least my reply to you made you look up some things about slavery internationally.
Again, you for some reason think I'm completely ignorant about the history of slavery. But I do admit there is much I don't know.
USA for sure was not alone in condoning, trade or practice chattel slavery, but the Western world for most part has fessed up to that awful history and tried to make amends (including US). Unlike the MAGA and the Trump administration. And you, apparently.
Also, some countries (say, Norway) made it illegal to have slave in their country but still allowed trading of slaves.
You did have a Civil War that the South said, more or less, was due to oppression by the North forbidding slavery. Guess where racism, systemic or otherwise, is still prevalent.
Also, the 1776 US Revolution prolonged slavery for several decades. The Brits outlawed it in their colonies in 1833.
Whatever made you think I was that ignorant, yet again? Things like this, and above, was on my curriculum when I grew up.
At the end I'll mention there is still a passage in the US Constitution where slavery is still allowed and practised today. I leave that as an exercise for you, but a hint is the 13th Amendment. Have a look at that history.